Mechanochromic polymers that change their photophysical properties on activation by mechanical force are now widely studied, which can signal mechanical stress and visualize material damage ahead of structure failure. However, white‐light‐emitting mechanochromic materials are still very rare. Here, a pyrene group is introduced into a mechanochromic elastomer. A blue‐green fluorescence is exhibited in the original elastomer through rational control of the aggregation degree of pyrene groups. During continuous stretching, due to the “closed” form of rhodamine‐based mechanophore changing into “opened” form, a remarkable white fluorescence can be seen in this process (chromaticity coordinate: x = 0.31, y = 0.31). In the processes of stretching and relaxing, an obvious red shift in fluorescence is detected by the naked eye, which is useful to monitor transient stress in polymer materials. The present study provides a new guideline of the molecular structure design for white‐light emitting mechanochromic materials.

中文翻译：

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可转换白色荧光的chrom官能化变色弹性体

现在，对通过机械力激活而改变其光物理性质的机械变色聚合物进行了广泛的研究，它可以发出机械应力并在结构破坏之前可视化材料损坏。但是，发白光的机械变色材料仍然非常少见。在此，将group基引入到机械变色的弹性体中。通过合理控制of基团的聚集程度，原始弹性体中会显示出蓝绿色荧光。在连续拉伸过程中，由于基于罗丹明的机制从“封闭”形式变为“开放”形式，因此在此过程中可以看到明显的白色荧光（色度坐标：x = 0.31，y= 0.31）。在拉伸和松弛过程中，肉眼可观察到明显的荧光红移，这对于监视聚合物材料中的瞬态应力很有用。本研究为发白光的机械变色材料的分子结构设计提供了新的指导。